Question about Microwave Ovens

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Kenmore microwave oven by LG

The Microwave works fine for 3 to 5 minutes the the power goes out. After about 15 minutes it resets its self and will work fine for a while as long as you don't cook over about 5 minutes.

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  • vincent_jim Oct 20, 2008

    Thanks for responding



    We purchased the oven in 1999



    Last year we replaced the control panel



    I just tested the microwave and I can feel air coming out of the top when I heated a cup of water.



    It is probabley at the end of its life but I did not want to give up with out trying to get some help.



    is there a way to test the magnetron? How can I get at the magnetron to see if there is a build up of dust that might cause it to over heat?



    Thanks for any help you can provide



    Jim Vincent

  • William Miller
    William Miller May 11, 2010

    The magnetron is overheating, and (luckily) the thermostat is protecting it by cutting the power until it cools.

    This overheating can be caused by blocked air vents or a failed cooling fan, or it can happen when the magnetron is failing.

    Does it sound like the internal cooling fan is working? It;s the one that should be one whenever it microwaves, not the vent hood exhuast fan.

    How long have you had it? Is it still under the 1-year warranty or the even the magnetron warranty?

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  • Microwave Ovens Master
  • 8,820 Answers

You can remove the grille and control panel and you may be able to see the magnetron. If not, the oven will have to come out of the wall and the cover will have to come off.

At our site, we have a video showing how to remove a typical over the range control panel assembly in under 5 minutes.

There may be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

Here is a link you or someone you know can use to test the magnetron, but please read the safety info: http://www.gallawa.com/microtech/mag_test.html

Even though it passes these tests, it may still be bad. If the cooling fan is working, then it's the magnetron. That simple, I'm afraid.

To order Goldstar / L.G. parts, visit Vance Baldwin Electronics.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Oct 21, 2008

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